Centrifugal mill.



PATENTED SEPT. 1, 190

O A. RAYMOND, DEGD.

I M. M. BARTBLME, ADMINISTRATRIX.

OENTRIFUGAL MILL.

APPLICATION FILED SEPT. 22, 1902. 2/ 5 $HEETS-$IIEET l.

Mil/mista- PATENTED SEPT. 1, 1908.

5 SHEETS-SHEET Z A. RAYMOND, DEOD.

M. M, BARTELME. ADMINISTRATRIX. OENTRIFUGAL MILL.

APPLICATION FILED ssmnzz, 1902.

PATENTED SEPT. 1, 1908.

- A. RAYMOND, DECD.

M. M. BARTELME, ADMINI$TRATRIX. GENTRIFUGAL MILL.

APPLICATION FILED SEPT.Z2, 1902.

5 SHEETS-SHEET 3.

.l/z Jul/17:

hil /720356451 No. 897,400. PATENTBD SEPT. 1, 1908. A. RAYMOND, DEGD.

M. M. BARTBLME. ADMINISTRATRIX.

CENTRIFUGAL MILL.

APPLIGA'IION FILED SEPT.Z2, 1902. "/1191.

5 SHEETS-SHEET 4.

0 a m 1 m 8 w, A mm 1 mmmmm? l vlyvallllllllvlyg No. 897,400. PATENTED SEPT. 1, 1908. A. RAYMOND, DEGD. M M BARTELME, ADMINISTBATRIX OENTRIFUGAL MILL.

APPLICATION FILED SEPT 22, 1902 5 SHEETS-SHEBT =5.

fivz'ifizxwga- UNiTED sTATEs PATENT OEEIOE.

ALBERT RAYMOND, or CHICAGO, ILLINOIS; MARY M. BARTELME ADMINISTRATRIX 0F SAID RAYMOND,

DECEASED.

CENTRIFUGAL MILL.

Specification of Letters Patent.

Patented Sept. 1, 1908.

To all whom it may concern:

Be it known that I, ALBERT RAYMOND, a' citizen of the United States, residing at Chicago, in the county of Cook and State. of Illinois, have invented certain new and useful Improvements in Centrifugal Mills, of which the following is a specification.

My invention relates to improvements in pulverizing mills of that type in which the pulverizing machinery is carried upon a central shaft which supports a spider or framework, upon which journal-boxes are pivotally mounted at their lower ends, said journalboxes carrying roll-shafts, to the u per ends of which are attached crushing-rolls.

The object of my invention is to provide a mill of this class, which shall be simple, strong, effective, easily accessible and readily and constantly lubricated, and readily assembled. These and such other objects as may hereinafter appear are attained by the devices illustrated in the accompanying drawings, in which Figure 1 is a vertical sectional view through my improved mill. Fig. 2 is a like view, at right angles to Fig. 1. Fig. 3 is an enlarged detail of the journal-box and at tached parts. Fig. 3 is a plan view of a detail. Fig. 4 is a plan view of Fig. 3. Fig. 4 is a detail. Fig. 5 is an enlarged detail of the geared elevating mechanism. Fig. 5 is a section on line ma: of Fig. 5. Fig. 6 is an enlarged detail, in elevation, of the lower portion of one of the journal-boxes. Fig. 7 is a perspective view of the base casting; and Fig. 8 is -a horizontal section on line 88 of Fig. 7. Fig. 9 is a transverse section illustrating the construction and arrangement of the plows and the contiguous parts.

Like reference numerals indicate the same parts in the several figures of the drawings.

Referring to'the accompanying drawings, 1 indicates a support, upon which is mounted the bowl or base casting 2. This bowl 'or base is preferably formed of a single casting comprising a base-plate 3, provided with a central opening surrounded by an annular shoulder 4, said plate being also provided with ribs or uprights 5 arranged to provide tangential openings therebetween communicating with the interior of the bowl, the inner edges of said uprights forming the vertical walls of the lower portion of the bowl. These uprights in turn support a flange 6, from the inner part of which rises a ring 7, which is provided internally with an annular shoulder 8, within which ring is seated the crushingring 9. Seated on the shoulder 4, and flush with the base-plate 3, is a plate 10, which is provided with an upwardly extending bearing 11 and a downwardly extending bearing 12, and also with downwardly and laterally extending wings 13, which support a yoke or bridge 14.

Mounted within a recess in the lower end of the main shaft 16 is a bearing-step 15, which rojects below the lower end of the main s aft 16. A portion of the bearingstep 15 is provided with an undercut shoulder between which and the wall of the recess-in the lower end of the main shaft, is cast, or otherwise filled in, a filling of Babbitt metal or the like, by means of which the step 15 is secured within the shaft 16.

Mounted within a suitable recess in the bridge 14, (Figs. 5 and 5 and adjacent to the lower end of the main shaft 16, is a bronze thrust block A, which carries a steel washer B and a bronze washer C, upon which rests the projecting end of the steel bearing-step 15. The washers B, C are loosely arranged upon the thrust block A in a familiar manner, and may be held in place laterally by integral fingers or lugs a projecting upwardly from the thrust block A. The block A is held against rotation by a key D, which engages the block A and the inner wall of the recess in the bridge 14 Within which the block A is mounted. Preferably there is a clearance between the side and bottom walls of the recess in the bridge 14 and the opposite walls of the block A, which clearance or space forms an oil-chamber from. which a lateral oil-duct E leads through the block A, whereby the oil has access to the washers B, C and the bearingstep 15.

18 is a screw-threaded shaft, whichis threaded through the bottom of the bridge 14 and is arranged to make contact with the block A. Threaded upon the shaft 18 is a nut 19. I find it desirable to provide the shaft 18 with a vertical slot 20 and to provide the nut 19 with a set screw 21 arranged to 'engage the slot 20. With the parts in their normal operative position, the nut 19 is screwed tightly against the bottom of the bridge 14, thereby serving as a jam-nut to hold the shaft 18 in position.

Mounted upon the upper end of the shaft 16 is a spider 19, which is keyed to the shaft 16 by means of a key 20 and referably rests upon a collar 21*, but the spi or may be rigidly mounted upon shaft 16 in any suitable manner.

22 are journal-boxes mounted upon the spider 19, preferably by means of trunnions 23, which are arranged eccentrically to the axes of the journal-boxes. Mounted upon the spider 19 and alternating with the journal-boxes 22, are castings 24, which are provided with plows 25. The plows 25 are arranged so that the forward edges thereof will be adjacent to the upper surface of the plate 10, which constitutes the bottom or floor of the pulverizing chamber, and the outer edges of the plows 25 are arranged to be adjacent to the inner walls of the pulverizing chamber. The rear edges of the plows 25 are arranged to overlap the lower edges of plows 26, which are mounted upon, or formed integrally with, the outer surfaces of the journal-boxes 22 and extend upwardly.

around the journal-boxes 22 and adjacent to the inner walls of the pulverizing chamber,

so as to overlap the lower forward edges or ends of a third set of plows 27. This third set of plows is bolted to the upper part of the castings 24 by means of clamping bolts 28, which extend through the plows 27 and the castings 24 and engage lugs 29 on the spider 19*, thereby securely clamping the castings 24, the plows 25, 27 and the spider 19 together and also clamping the trunnions 23 of the journal boxes 22 in seats or bearings formed therefor between the spider 19 and the castings 2 4. The plows 27 extend upwardly adjacent to the walls of the pulverizing chamber and in a direction to carry the material to be pulverized in front of the grinding rolls and between the rolls 30 and the crushing ring 9.

Secured to the frame of the crushing machine, and above the pulverizing chamber, is a housing 31 provided with doors 32 and a separating cone 33 of familiar form. The material to be crushed is fed to the crushing chamber by an agitator 34 through a feedspout 35. This agitator 34 is geared to the main driving mechanism to secure a. uniform feed in unison with the speed at which the driving machinery may be running.

The main shaft 16 is lubricated by means of an oil-pipe 36, which communicates with the oil-duct 37 in the journals 11, 12, said oilduct leading to an annular oil-chamber 38 countersunk within the upper end of the journal 11, so as to surround the main shaft 16, from which chamber oil will work between the main shaft'16 and the bearing 17. The bearings at the lower end of the main shaft are likewise lubricated by means of an oil-pipe 38 leading to an oil-chamber surrounding said bearin s.

Rigidly attached to the main shaft 16, ad-

gear-wheel 40, which meshes with a gearwheel 41. drive-shaft end within The gear-wheel 41' is driven by a 42, which is journaled at its inner a journal box 43 extending laterally from the bearing 12, and is rotated by means of the drive-pulley 44.

The roll shaft journal-boxes are constructed as follows (see Fig. 3): 22 is a casing, generally cylindrical in form, which forms the outer wall of is provided with trunnions23 and a plow 26. Fitted within this casing is a bearing, in the form of a bushing, 45, which is preferably cut away, as shown in Fig. 3, to provide oilchambers 46 and 47. Arranged to rotate within the bearing is a rollshaft 48 provided at its lower end with a bearing-step or block 49, preferably of steel. This block is formed with an undercut shoulder 50 and is secured within a recess in the lower end of the roll-shaft 48 by means of lead or other suit- .able metal 51, which is filled in said recess and around the step 49 in the manner shown and so as to leave the lower end of the steel step 49 projecting below the roll-shaft 48 and resting upon a bearing 52, which is mounted, and secured against rotation, by lugs 53, within the lower end of the journal-box. The roll-shaft 48 is also provided with an annular shoulder 54, adjacent to its lower end, which abuts against the lower end of the bearing 45. The bearing 45 is preferably formed with an annular shoulder or flange adjacent to its upper end, which is arranged to rest upon theupper end of the casing or casting 22 and to be clamped between the. casting 22 and the cap-piece 56, forming the upper end of the journal-box; The upper en of the bearing 45 extends upwardly a the-journal-box and which 7 short distance within the cap-piece 56, the

remaining space within the cap-piece 56 being filled with packing 57. The upper portion of the roll-shaft 48 is tapered to receive the crushing-roll 58. This roll may be secured to the roll-shaft by means of a key 59, which is driven through an o ening through the projecting end of the roll-shaft 48 and between lugs or shoulders 60 and 61 upon the upper surface of the crushing-roll. This prevents rotation as between theroll 58 and shaft 48.

The key 59 is secured in position by means of a bolt 62, which extends through the lugs 61 and across the head of the key 59. The roll 58 is provided with an oil or sediment chamber 63, to which oil is admitted through a suitable assage, which is closed by a cap 64. The sfiaft 48 is provided with a longitudinal oil-passage or duct 65, to the upper end of which access is had by means of a transverse duct 66, which opens from the sediment chamber 63 at a point above the bottom of the chamber 63-.

In a location adjacent to the bearing 45,

recess or chamber is also filled with suitable packing.

The operation of the device is as follows: With the parts assembled as shown in Fig. 1, a current is induced through the machine, by means of any suitable apparatus communicating, at 72, with the u per end of the separating cones. This in uced current enters the housing 31 and, passing therefrom through the tangential openings between the ribs, enters the bowl of the crushing-chamber as a gyrating air-current. At the same time, by means of the pulley 44 and drive-shaft 42, the main shaft 16 is caused to rotate, and the material to be crushed is fed to the pulverizing chamber through the spout 35. Such of this material as falls to the bottom of the pulverizing chamber is caught up first by the plows 25, which operate in conjunction with the air current to carry the material upwardly to the plows 26 on the journal-boxes and thence to the plows 27, which deliver the material immediately in front of the advancing and rotating crushing rolls 30. The rolls 30 being mounted upon the up er ends of the roll-shafts, and the journa -boxes which carry the shafts being mounted eccentrically upon the spider, the normal tendency of the crushing-rolls is to gravitate against the crushing ring. With the rotation of the main shaft and of the spider, this tendency of the crushing-rolls is supplemented by cen trifugal force and, as the rolls are lifted by refractory material coming between them and the crushing-ring, the combined action of gravity and centrifugal force is to pound the rolls back against the crushing-ring. As the material is crushed and pulverized, it is carried upwardly around the separatin cones in a manner well known in this art an the heavier particles are returned through the central cone and dropped back into the crushing machinery. It will be observed that the roll-shafts continuously rotate in a closed chamber, filled with oil for the full length of the bearings of the roll-shafts, and that the only opening through which dust, grit, etc., could obtain access to the roll-shaft bearing is located in a position where the crushing-roll serves as a dust-guard and dust cannot reach the bearing, which is amply protected, first, by the plate 70, with its flange 71, by the packing within the chamber 69, by the cap-piece 56 and the packing 57 within the cap-piece, and then by the close-fitting upper end of the bearing 45. At the same time, the parts are so arranged that any desired quantity of oil may be freely fed to the bearings of the roll-shaft without disturbing the devices arranged to protect these bearings against dust and grit; while, if any dust or grit should work into the chamber 63,'it will be deposited in the bottom of the chamber below the oil-duct 66. It will also be observed that the crushing machinery is mounted within a crushing chamber or bowl having a closed bottom except for the central opening through the bearing 11, within which the main shaft rotates, which opening is effectively protected by the hub of the spider which fits thereover, which protection is supplemented by the air-duct 73, by means of w 'ch an inflowing current of air may be provided to keep dust from being blown into the main-shaft bearings.v The main shaft also-continuously rotates Within an oil bath.

If it is desired to remove the crushing machinery, this can be simply and readily done without detaching any of the gearing, in the following manner: The set screw 39 is loosened so as to disengage the main shaft 16. Then the nut 19 is unscrewed and run down on the threaded rod 18. The set screw 21 is now screwed into the slot 20 upon the rod 18, thereby keying the nut 19 to the rod 18. By means of any suitable device, such, for instance, as rods inserted into holes 74 in the nut 19, the nut 19 is now rotated, thereby also rotating the' rod 18, which, being screwthreaded within the bridge 14, elevates the bearing 15 and main shaft 16, which, of course, lifts with it the spider 19, the journalboxes, crushing-rolls, plows, etc. 'llhisrelevation of the parts is continued until the crushing machinery can be readily reached through the doors 32 in the housing 31, all without disengaging the gearing in any manner other than by loosening the set screw or key 39, by which the gear-wheel 40 is geared or keyed to the shaft 16.

It will be noted that the roll-shaft 48 is reduced in size at a point near the upper end of the journal-box 22 and that the bushing 45 is contracted at its upper end where it fits snugly about this reduced portion of the rollsha ft. When the machine is in operation, the tendency of centrifu a1 force is to throw 'the oil within the j'ourna box to that side of the inner chamber of the j ournal-box which 1 her from which oil cannot pass Without flowing inwardly in a direction toward the main shaft in order to pass over said shoulder.

Of course, various modifications in details may be made Without departing from the spirit of my invention, and such modifications are contemplated hereby.

I claim:

1. In a machine of the class described, the combination with a bowl having a closed bottom and rovided with tangentiallyarranged air inl its through its vertical wall, of a bearing projecting upwardly from the bottom thereof, a main shaft mounted within said bearing, a support carried by said main shaft, a journal-box pivotally mounted near its lower end upon sald support, said pivotal mounting being provided eccentrically of the axis of the journal-box and between the j ournal-box and shaft, a roller-shaft mounted within said journal-box and projecting from the upper end thereof, a crushing-roll carried by the projecting portion of said roll-shaft, and means for rotating said main shaft and the members associate therewith, substantially as described.

2. In a machine of the class described, the combination with a bowl having a closed bottom and royided with tangentially arranged air in ets through its vertical wall, of abearing projecting upwardly from the bottom of said bowl, a main shaft mounted within said bearing, a support carried by said main shaft, a journal-box pivotally mounted near its lower end upon said support, a rollshaft mounted Within said journal-box, a crushing roll carried by said roll-shaft, a

crushing-ring arranged opposite to said crushing-roll, means arrang to carry material upwardly within said bowl and to deliver the same to the crushing devices, said means comprising an upper and a lower plow supported by said main shaft, and an intermediate plow carried by the journal-box, substantially as described.

3. In a machine of the class described, the combination with the main shaft, of a suport carried thereby and carrying a journalgox having an integral closure at its lower end, a roll-shaft mounted Within said j ournalboX and projecting from the upper end thereof, a bearing in the form of a bushing mounted upon said roll-shaft and within said journal box, said bushing projecting out of said journal-box, and a cap-plece mounted upon the upper end of said journal-box and providing a stufiing-box around said roll-shaft,

substantially as described.

4. In a machine of the class described, the combination with a journal-box closed at its lower end, of a roll-shaft mounted within said journal-box and projecting from the upper end thereof, a bearin in the form of a bushing mounted upon said roll-shaft and within r said journal-box, said bushing projecting out of said journal-box, a cap-piece mounted upon the upper end of said journal-box and providing a stufling-box around said rollshaft, a crushing-roll mounted upon the pro,- jccting end of said roll-shaft, and provided on its under side with an annular chamber surrounding said shaft, and a perforated disk arranged to close said chamber, substantially as described.

5. In a machine of the'class described, the combination with a journal-box, of a rollshaft journaled therein and projecting from the upper end thereof, a crushing-roll mounted upon the projecting end of said roll-shaft, said crushing-roll being rovided with an oilduct and said roll-shaft eing provided with a longitudinal oil-duct arranged to communicate at a point inside of the crushing-roll with the oil-duct in said crushing-roll, and

also arranged to communicate with the bear ings of said roll-shaft within the journal-box, substantially as described.

6. In a machine of the classdescribed, the combination with a journal box, of a bushing mounted therein, a roll-shaft j ournaled Within said bushing and projecting from said journal-box, all arranged to provide an oilchamber within said journal-box and communicating with the roll-shaft bearings, said roll-shaft being provided with a longitudinal oil-duct arranged to supply oil to said oil chamber, a roll mounted upon the projecting end of said roll shaft and provided with an oil-chamber in free communication with the oil-duct within said roll-shaft, said roll being also provided with a feed duct communicating with said oil-chamber, substantially as described. 7 V

7. In a machine of the class described, the combination with the main shaft, of a suport carried thereby and carrying a journal box closed at its lower end, a bearing bushin disposed within said journal-box, and a rollshaft j ournaled within said bearing bushings and projecting from the upper end of said journal-box, all arranged to provide an oilchamber within said journal-boX and in communication with said roll-shaft-journal, and means for supplying oil to said oil-chamber, substantially as described.

8. In a machine of the class described, the combination with a main shaft, of a suport carried by said main shaft, a journalboX closed at its lower end and mounted upon said support and enlarged laterally intermediate lts ends, a roll-shaft mounted within said j ournal-box, and a bushing mounted upon said roll-shaft and within said journalboX, said bushing being reduced in size opposite the lateral enlargement of the journaltures, whereby an oil cavity is produced and communicating with the journal of the rollshaft, substantially as described.

9. In a machine of the class described, the

combination with a rotatable main-shaft, of a support carried thereby, a journal-box carried by said support, a roll-shaft mounted within said journal-box, a bushing also mounted within said journal-box and forming a bearing for said roll-shaft, said rollshaft being reduced in size near the upper end to form a lateral shoulder, and said bushing having an inwardly extending flange bearing upon said shoulder, substantially as described.

10. In a machine of the class described, the combination with a roll-shaft, and a crushing-roll, means for eratively securing said roll to said shaft, said means com rising a key arranged to be driven through tlie end of said shaft where it projects through said roll, lugs formed upon said roll adjacent to the projecting ends of said key, and a pin extending through two of said lugs and across the head of said key, substantially as described.

11. In a machine of the class described, the combination with a bowl provided with tangentially arranged air-passages through the vertical wall thereof, of a main shaft extending upwardly from the bottom of said bowl, a support keyed to said main shaft,

a journal-box pivotally mounted adjacent to its lower end u on said support, a rollshaft mounted wit in said journal-box and projecting from the upper end thereof, a crushing-roll carried by the projecting portion of said roll shaft, acrushing ring mounted opposite to said crushing-roll, means carried by said support arranged to elevate the material to be crushed and to deliver it between the crushing-roll and the crushing I ring, said means comprising an upper and lower plow supported .by said main shaft, and an intermediate plow carried by said journal-box.

12. In a machine ofthe class described, the combination with a bowl, of a main shaft, crushing devices, means arranged to carry material upwardly within said bowl and to deliver the same to the crushing devices, said means com rising an upper and a lower plow sup orted y said main shaft, and an interme iate plow, said plows actuated by the rotation of said main shaft, substantially as described.

ALBERT RAYMOND. Witnesses M. E. SHIELDS, (I. H. DRURY. 

